The megastar invents ways to keep workout boredom from setting in. She keeps sit-ups interesting by “doing them on the ball,” and she knows how to use music for motivation.

“I do a lot of things with little weights — like, I’ll put on a song that I really like and I’ll do [bicep curls with] 5-pound weights for the duration of the song and just try to burn out,” she told SELF.

2. Jennifer Aniston Loves Yoga (and a Good Laugh)

According to Aniston’s trainer Mandy Ingber, Jen comes by her famously flat abs by doing core-engaging yoga moves. But she also has a (funny) secret.

“Jen loves to laugh, and I would guess that is a part of why her abs are so toned,” Ingber told SELF.

Like Beyonce, she also picks tunes that power her workouts.

“Jen actually turned me on to Kings of Leon’s ‘Use Somebody’ and Jay Z’s ‘Empire State of Mind,'” Ingber said.

3. Bridget Moynahan Sculpts Her Legs

“Blue Bloods” actress Moynahan is known for her long, sexy legs. Her secret? Lower body toners! Bridget’s trainer, John De Young, works her butt and thighs by doing lunges and bridges.

Lie face up with right foot flat on top of BOSU, left leg extended straight up to ceiling, arms extended at sides, palms up. Press right foot into BOSU and lift torso until in line with right thigh. Hold for two counts, then lower back to start. Do 15 reps.

4. Madonna Rocks a Ballet Body

Madonna has a brand-new fitness regimen: For the last several months, the Queen of Pop has been working with trainer Sadie Lincoln, founder of barre3.

The class focuses on achieving balance, strength, and flexibility — and if you’ve ever seen her show, you know the Material Girl has all of the above!

5. Anna Paquin Cross-Trains

Paquin takes her workouts very seriously — her role on “True Blood” requires nudity, tight tops and short shorts. How does she shape up for her sexy show? She pretty much does every workout you’ve ever heard of.

“I like to mix things up so I’m not doing the same thing every single day,” she told SELF. That means swimming, running and boxing, Bar Method, Core Fusion and Pilates classes.

Anna also works out on the elliptical and stationary bike she keeps in her garage. “Let’s face it, gyms aren’t open at four in the morning. So if I can’t do anything else, I can get a perfectly good workout in my garage!” she said.

6. Amanda Seyfried Doesn’t Skip Weekends

Seyfried, one of young Hollywood’s hottest stars, combines running and Pilates to battle belly bulge. Amanda runs a half hour four to five days a week –“because I feel guilty when I don’t,” she tells SELF — and does Pilates with her teacher, Nikiko, on the weekends.